Erik Grossmann, MD
Colon & Rectal Surgery · Columbia, MONPI 1851367601
Payments from drug & device makers
What this record shows
The money is spread across several categories — education (44.4%), travel and lodging and food and beverage — rather than concentrated in one kind of arrangement. Intuitive Surgical accounts for 90.9% of it on its own, with 5 other manufacturers making up the rest. Reporting peaked in 2021 at $2,072 and has fallen 96.3% since, to $77 in 2025. That places this record below the midpoint for colon & rectal surgery clinicians in MO, where the typical reported total is $4,503.
Across 35 payments — averaging $128.65 each. Meals, travel, consulting and speaking fees, gifts and royalties reported by drug and device makers.
- Intuitive Surgical$4K
- Johnson & Johnson$152
- Guard Medical Inc.$127
- Stryker$85
- Lifenet Health$23
- Cook Medical LLC$21
What the payments were for
- Speaking & faculty fees$1022%
- Travel & lodging$1,48633%
- Food & beverage$91520%
- Education$2,00044%
General payments by program year
Who reported the general payments
Companies are grouped under their corporate parent — a single manufacturer often files under several CMS reporting entities. Research and ownership payments are counted separately and are not in this table.
| Company | Payments | Total |
|---|---|---|
| Intuitive Surgical | 28 | $4,095 |
| Johnson & Johnson | 3 | $152 |
| Guard Medical Inc. | 1 | $127 |
| Stryker | 1 | $85 |
| Lifenet Health | 1 | $23 |
| Cook Medical LLC | 1 | $21 |
What the payments were tied to
Products named in the reported payments. Only payments of $100 or more are attributed here — the typical reported payment nationally is a meal worth about $16, and listing those product-by-product would be noise.
- Da Vinci Surgical System$2,587
- DAVINCI XI$1,000
- NPseal$127
- NPSEAL MEDIUM$127
- NPSEAL LARGE$127
How this compares
$4,503 in reported general payments places this provider in the 50th percentile of 36 colon & rectal surgery providers in Missouri.
Medicare billing
What this is not: this is the amount Original Medicare Part B allowed for services this provider billed in 2024. It is not their income. It excludes Medicare Advantage — now more than half of all Medicare enrollment — along with Medicaid and all commercial insurance, and it is gross practice revenue before staff, rent, supplies and malpractice premiums. CMS also suppresses any figure covering ten or fewer patients, so low-volume providers appear smaller than they are.
Most prescribed under Part D
| Drug | Claims | Cost to plans & patients |
|---|---|---|
| Oxycodone Hcl | 42 | $135 |
| Metronidazole | 43 | $51 |
Paid to pharmacies, not to this prescriber.
Other colon & rectal surgery in Columbia
- Reggie VadenColumbia$3K
- Zihao WuColumbia$2K
- Daniel PeyserColumbia$407
- Lawrence MendelowSaint Louis$234K
- Robert AmajoyiKansas City$56K
- Paul WiseSaint Louis$24K
- Donald SummersSaint Louis$22K
- Steven HuntSaint Louis$17K
- Tatiana Ramirez DominguezSaint Louis$12K
- Eric LedermanSaint Louis$11K
Where these figures come from
- Payments: CMS Open Payments, program years 2019–2025 (publication P06302026_06032026).
- Billing: Medicare Physician & Other Practitioners, data year 2024. Original Medicare Part B only.
- Identity: NPPES NPI Registry, July 2026.